Hedman 66381 Details

Due to cylinder heads (aluminum), Generation 6 BB-Chevy 502 will have clearance problems on some applications. Bottom of header flanges may hit head bolts. Notching may be necessary.

Designed for use with Trans-Dapt throttle body spacer

Not legal for sale or use in California

Modification to stock exhaust required to retain catalytic converter

Not applicable or intended for street or highway use (legal only for racing vehicles which may never be used on a highway)

Applications

1982-86 Chevy K30

1982-91 GMC K3500

1988-91 Chevy K3500

Specifications:

Application

Automotive

Tube Direction

Down Swept

Gaskets Included

Yes

Header Finish

Silver ceramic coated

Header Material

Steel

Header Style

Full-length

Motor Mounts Included

No

Tuned

No

Bolts/Studs Included

Yes

Catalytic Converter(s) Included

No

Cross Over Pipe Included

No

Reducers Included

Yes

Transmission Mount Included

No

Weld-Up

No

Primary Tube Diameter (in.)

1 3/4

Quantity

Sold as a pair

Primary Tube Gauge

18-gauge

Flange Style

Standard

Collector Attachment

Ball and socket flange

Collector Diameter (in.)

3

Manufacturer's Part Number:

66381

Shipping Weight:

31

Package Height:

8.25

Package Depth:

39

Package Width:

16.5

Hedman's HTC Hi-Tech Coated Headers come pre-coated from the factory with a protective ceramic-metallic finish. This coating provides a durable, shiny finish that helps lower under hood temperatures. Hedman Hedders pioneered the automotive application of ceramic-metallic coatings in the early 1980s. Previously exclusive to the aerospace industry, Hedman Hedders recognized the coating's potential to improve both the lifespan and functionality of exhaust headers while adding performance, flow and protection. Made in the USA.

Features:

Coating offers protection up to 1400°.

Won't chip, peel, or "blue" like chrome.

Superior heat insulation.

Increased exhaust velocity for more power.

NOTE: Installing coated headers on an engine during the break-in period will cause discoloration. The use of factory manifolds or an old set of headers is recommended while breaking in an engine.

JEGS Easy Kits are designed by JEGS Professionals to help you get all the performance parts you need.

1982-1986
GMC K3500 PICKUP

1988-1991
GMC K3500 PICKUP

1988-1991
GMC K3500 PICKUP

Liter: 6.2

SubModel: SIERRA

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 4.8

SubModel: SILVERADO

CUI: 292

EngineType: L6 ( 4.8 L / 292 )

1982-1986
CHEVROLET K30 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: SILVERADO

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 4.8

SubModel: SCOTTSDALE

CUI: 292

EngineType: L6 ( 4.8 L / 292 )

1988-1991
GMC K3500 PICKUP

EngineType: ALL

SubModel: SIERRA SLX

1982-1986
CHEVROLET K30 PICKUP

Liter: 5.7

SubModel: SILVERADO

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1988-1991
CHEVROLET K3500 PICKUP

Liter: 5.7

SubModel: CHEYENNE

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1988-1991
CHEVROLET K3500 PICKUP

Liter: 6.2

SubModel: SILVERADO

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 6.2

SubModel: CUSTOM

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 5.7

SubModel: SCOTTSDALE

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1982-1986
GMC K3500 PICKUP

Liter: 6.2

SubModel: BASE

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1982
GMC K3500 PICKUP

EngineType: ALL

SubModel: SIERRA GRANDE

1982-1986
CHEVROLET K30 PICKUP

Liter: 6.2

SubModel: SILVERADO

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1988-1991
CHEVROLET K3500 PICKUP

Liter: 6.2

SubModel: CHEYENNE

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1982-1986
GMC K3500 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: BASE

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1982-1986
CHEVROLET K30 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: SCOTTSDALE

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 6.2

SubModel: SCOTTSDALE

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1982-1986
CHEVROLET K30 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: CUSTOM

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1988-1991
CHEVROLET K3500 PICKUP

Liter: 5.7

SubModel: SILVERADO

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 5.7

SubModel: CUSTOM

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1982-1986
GMC K3500 PICKUP

Liter: 5.7

SubModel: BASE

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1982-1986
GMC K3500 PICKUP

EngineType: ALL

SubModel: SIERRA CLASSIC

1988-1991
CHEVROLET K3500 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: SCOTTSDALE

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1982-1986
CHEVROLET K30 PICKUP

Liter: 4.8

SubModel: CUSTOM

CUI: 292

EngineType: L6 ( 4.8 L / 292 )

1982-1986
GMC K3500 PICKUP

Liter: 4.8

SubModel: BASE

CUI: 292

EngineType: L6 ( 4.8 L / 292 )

1988-1991
GMC K3500 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: SIERRA

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1988-1991
CHEVROLET K3500 PICKUP

Liter: 6.2

SubModel: SCOTTSDALE

CUI: 379

EngineType: V8 ( 6.2 L / 379 )

1988-1991
GMC K3500 PICKUP

EngineType: ALL

SubModel: SIERRA SLE

1988-1991
CHEVROLET K3500 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications

Liter: 7.4

SubModel: SILVERADO

CUI: 454

EngineType: V8 ( 7.4 L / 454 )

1988-1991
CHEVROLET K3500 PICKUP

Liter: 5.7

SubModel: SCOTTSDALE

CUI: 350

EngineType: V8 ( 5.7 L / 350 )

1988-1991
CHEVROLET K3500 PICKUP

Fitment_Note: Modification To Stock Exhaust Required To Retain Catalytic Converter~Early Chassis Only~Designed For Use With A Trans-Dapt Throttle Body Spacer~502 Big Block Chevy Will Have Clearance Problems On Some Applications